Mathmetics

ISBT Mathmetics for all banking PO,Clerk,IBPS PO,Railway,SSC,IAS,OAS Exams

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Q1.
A sum was put at a certain rate of interest for 5 years. Had it been put at 2% higher rate, it would have fetched Rs. 72 more. What is the sum ?
1) Rs. 4,250 2) Rs. 4,500
3) Rs. 6,400 4) Rs. 7200
5)None of these
Answer : Rs. 7200
Explanation :
We know that Sum = (S.I X 100 )/ R X T
 = (Diff. in S.I X 100 ) / Diff. in rate X Time 
= (72 X100)/ 2 X 5 =  Rs. 7200.
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Q2.
A man lent out Rs.12000 partly at 12% and partly at 15% simple interest . His total income after 2 years was Rs.3300. What is the sum lent at 12% simple interest ?
1) Rs.4000 2) Rs.5000
3) Rs.6000 4) Rs.7000
5)None of these
Answer : Rs.5000
Explanation : Let, the sum lent at 12% simple interest is Rs.X. 
So, the sum lent at 15% simple interest is (Rs.12000 - x).
Then,
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Q3.
What should be the simple interest obtained on an amount of Rs. 67400 at the rate of 8% p.a. after 3 years ?
1) Rs. 12380 2) Rs.16176
3) Rs.18240 4) Rs.19020
5)None of these
Answer : Rs.16176
Explanation : SI = [(67400 x 3 x 8) ] /100 = Rs.16176
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Q4.
A person deposited Rs.8000 which amounted to Rs.9200 after 3 years at simple interest . Had the interest been 2% more, how much he would get ?
1) Rs.8,660 2) Rs.9,680
3) Rs.10,620 4) Rs.11,540
5)None of these
Answer : Rs.9,680
Explanation : Given, P = 8,000 , T=3 yrs A= 9200 
So, S.I = 9200 - 8000 = 1200 
Then , R = (1200 X 100 ) / 8000 X 3 = 5%
After 2% rate increases  , new rate will be 7%.
So, new SI=( 8000 X 3 X 7) / 100 = 1680
Thus, new amount = 8000 + 1680 = 9,680

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Q5.
If Rs.85 amounts to Rs.95 in 3 years, what Rs102 will amounts to in 5 years at the same rate percent ?
1) Rs112 2) Rs.118
3) Rs.122 4) Rs.132
5)None of these
Answer : Rs.122
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Q6.
A sum of money lent at simple interest amounts to Rs.720 after 2 years and to Rs. 1020 after a further period of 5 years. Find the rate of interest.
1) 6% 2) 8%
3) 10% 4) 12%
5)None of these
Answer : 10%
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Q7.
Alok borrowed Rs.2500 from two money lenders. For one loan, he paid 5% and for the other, he paid 7% per annum.The total interest paid for two years was Rs.265. How much did he borrow at 7% rate ?
1) Rs.625 2) Rs.825
3) Rs.1875 4) Rs.1675
5)None of these
Answer : Rs.625
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Q8.
A man lent Rs.600 for 2 years and Rs.200 for 3 years at the same rate at simple interest and received only Rs.90 as interest. What was the rate of interest ?
1) 4% 2) 5%
3) 6% 4) 7.5%
5)None of these
Answer : 5%
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Q9.
The simple interest on a certain sum of money at 4 % per annum for 4 years is Rs.19 more than interest on the same sum for 3 years at 5% per annum. Find the sum of money.
1) Rs.6700 2) Rs.7500
3) Rs.8000 4) Rs.8500
5)None of these
Answer : Rs.8000
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Q10.
The compound interest on a certain sum for 2 years at 10% per annum is Rs. 525. The simple interest on the same sum for double the time at half the rate percent per annum is:
1) Rs. 400 2) Rs. 500
3) Rs. 600 4) Rs. 800
5)None of these
Answer : Rs. 500
Explanation : P = Rs. 100  
Given, R= 10% Time = 2 yrs 
So, C.I = Rs. 21  So,21 %  = 525 
100%  = (525/21) /100 = 2500
Then, P = (2500 x 5 x 4 ) /100 = Rs. 500
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